Определение MAC адреса сетевой карты

Данная функция возвращает Medium Access Control (MAC) адресс для сетевой карты. MAC адрес - это уникальное число длиной 48-бит, которое присваивается сетевой карте производителем. MAC адрес используется для маппинга в TCP/IP сетях. TCP\IP под Windows NT позволяет компьютеру связаться через сеть с другим компьютером используя IP адрес, либо имя хоста, либо NetBIOS имя. Однако, в конечном счёте любое из этих трёх имён будет преобразовано в MAC адрес. Компилятор: VB4-32, VB5, VB6

Option Explicit

Public Const NCBASTAT As Long = &H33
Public Const NCBNAMSZ As Long = 16
Public Const HEAP_ZERO_MEMORY As Long = &H8
Public Const HEAP_GENERATE_EXCEPTIONS As Long = &H4
Public Const NCBRESET As Long = &H32

Public Type NET_CONTROL_BLOCK  'NCB
   ncb_command    As Byte
   ncb_retcode    As Byte
   ncb_lsn        As Byte
   ncb_num        As Byte
   ncb_buffer     As Long
   ncb_length     As Integer
   ncb_callname   As String * NCBNAMSZ
   ncb_name       As String * NCBNAMSZ
   ncb_rto        As Byte
   ncb_sto        As Byte
   ncb_post       As Long
   ncb_lana_num   As Byte
   ncb_cmd_cplt   As Byte
   ncb_reserve(9) As Byte ' Reserved, must be 0
   ncb_event      As Long
End Type

Public Type ADAPTER_STATUS
   adapter_address(5) As Byte
   rev_major         As Byte
   reserved0         As Byte
   adapter_type      As Byte
   rev_minor         As Byte
   duration          As Integer
   frmr_recv         As Integer
   frmr_xmit         As Integer
   iframe_recv_err   As Integer
   xmit_aborts       As Integer
   xmit_success      As Long
   recv_success      As Long
   iframe_xmit_err   As Integer
   recv_buff_unavail As Integer
   t1_timeouts       As Integer
   ti_timeouts       As Integer
   Reserved1         As Long
   free_ncbs         As Integer
   max_cfg_ncbs      As Integer
   max_ncbs          As Integer
   xmit_buf_unavail  As Integer
   max_dgram_size    As Integer
   pending_sess      As Integer
   max_cfg_sess      As Integer
   max_sess          As Integer
   max_sess_pkt_size As Integer
   name_count        As Integer
End Type
   
Public Type NAME_BUFFER
   name        As String * NCBNAMSZ
   name_num    As Integer
   name_flags  As Integer
End Type

Public Type ASTAT
   adapt          As ADAPTER_STATUS
   NameBuff(30)   As NAME_BUFFER
End Type

Public Declare Function Netbios Lib "netapi32.dll" _
   (pncb As NET_CONTROL_BLOCK) As Byte
     
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
   (hpvDest As Any, ByVal _
    hpvSource As Long, ByVal _
    cbCopy As Long)
     
Public Declare Function GetProcessHeap Lib "kernel32" () As Long

Public Declare Function HeapAlloc Lib "kernel32" _
    (ByVal hHeap As Long, ByVal dwFlags As Long, _
     ByVal dwBytes As Long) As Long
     
Public Declare Function HeapFree Lib "kernel32" _
    (ByVal hHeap As Long, _
     ByVal dwFlags As Long, _
     lpMem As Any) As Long


Public Function GetMACAddress() As String

  'запрашиваем MAC Адрес для сетевой карты
  'возвращаем форматированную строку
   
   Dim tmp As String
   Dim pASTAT As Long
   Dim NCB As NET_CONTROL_BLOCK
   Dim AST As ASTAT

   NCB.ncb_command = NCBRESET
   Call Netbios(NCB)
   
  'Для получения Media Access Control (MAC) адреса для сетевой карты
  'программным путём, используется команда Netbios() -
  'NCBASTAT с именем "*" в поле NCB.ncb_CallName (в 16-символьной строке).
   NCB.ncb_callname = "*               "
   NCB.ncb_command = NCBASTAT
   
  'Для машин с несколькими сетевыми картами Вам необходимо использовать
  'номер LANA и выполнять команду NCBASTAT для каждого. LANA номер 0 всегда
  'соответствует первому сетевому адаптеру. Конечно можно использовать LANA номер
  'и для одного сетевого адаптера, но это будет считаться как неэффективное
  'программирование.
   NCB.ncb_lana_num = 0
   NCB.ncb_length = Len(AST)
   
   pASTAT = HeapAlloc(GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS _
            Or HEAP_ZERO_MEMORY, NCB.ncb_length)
            
   If pASTAT = 0 Then
      Debug.Print "memory allocation failed!"
      Exit Function
   End If
   
   NCB.ncb_buffer = pASTAT
   Call Netbios(NCB)
   
   CopyMemory AST, NCB.ncb_buffer, Len(AST)
   
   tmp = Format$(Hex(AST.adapt.adapter_address(0)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(1)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(2)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(3)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(4)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(5)), "00")
           
   
   HeapFree GetProcessHeap(), 0, pASTAT
   
   GetMACAddress = tmp

End Function

'--end block--'
   

Option Explicit

Private Sub Command1_Click()

   Text1 = GetMACAddress()

End Sub

'--end block--'